电动车两档变速器换挡机构设计毕业设计(论文).doc

HUNAN UNIVERSITY 毕业设计(论文) 设计论文题目： 电动车两档变速器 换挡机构设计 学生姓名： 曹文研 学生学号： 20110402426 专业班级： 11级车辆四班 学院名称： 机械与运载工程学院 指导老师： 周云山 学院院长： 韩旭 2015 年5 月 20 日  电动车两档变速器换挡机构设计 摘 要 变速器已经因为其对性能较大的提升逐渐成为一个电动车不可或缺的一部分，目前最常用的是AMT变速器。本论文为此类型变速器设计一个换档机构（包括电机驱动的换挡执行机构），主要重点有： 1，根据对电动汽车变速器的受力分析，对换挡机构进行结构设计，从而保证换挡机构性能，保证换挡过程中不可与其他零件产生干涉，结构紧凑。准确地实现换挡电机对同步器的控制功能。 2，保证换挡电机符合要求。需要计算同步器力矩和换挡力的大小，可以通过对换挡同步过程进行分析，通过约束换挡速度和拨叉行程这两个参数在合理范围内，根据不同换挡时刻主从动齿轮的转速差，由此计算出换挡力，以此为依据完成选换挡电机及传动机构的参数设计。 3，要选择合适的电动执行机构的结构形式，保证电动执行机构可以可靠平稳的换挡，并且通过结构设计对换挡过程进行优化，达到减小换挡时的冲击，保证寿命，减小换挡电机功率，减小成本的优点。 关键词：电动车两档变速器，换挡机构，结构设计，换挡过程优化，三维建模 Electric car two speed transmission shift mechanism design Abstract because of its great performance，Transmission is becoming an integral part of an electric car, the most commonly used is the AMT transmission. this thesis is about designing a shift mechanism for this type of transmission (including a motor-driven shift actuator), the main focus are: 1, based on stress analysis of electric vehicle transmission, the shift mechanism is designed to ensure that the performance of the shift mechanism to ensure that the shift process can not interfere with other parts, compact structure. Achieving the Shifting motor to control the synchronization accurately. 2, to ensure the shift motor compliance with the requirements. Need to calculate the synchronization torque and the shifting power. Through an analysis of shifting during synchronization.By constraining the shifting rate and shift fork movement within reasonable limits to calculate the shifting force,depending on these,we can choose the appropriate shifting motor and shifting mechanism. 3,To select the appropriate electric shifting actuator form, guarantee electric shifting actuator smooth and reliable, and by the structural design to make the shifting process optimization, to reduce the impact of the shift time to ensure longevity, reduced